Hi, first of all, gsc modding has nothing to do with C++. If you want the latest gsc files, you need to update your game. The changes you see in modern warfare 2 such as: weapon bug fixes etc.. are little fixes in gsc files. The syntax checker is usually built-in feature on the console of moden warfare 2 however, you cannot acces this due to legality. Syntac checker is a feature that checks if theres any error that terminates your game/sever(s). Theres been a program made to replace "legality disabling" and allow you to check for any problems in your GSC (syntax error checking). The program is called "FFViewer". This program let's you to open,save,edit,extract gsc files from .FF files. In that program theres a syntax checker feature. It's buggy, but it's good for a start 